San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Can Rats Kill Mice?
Before providing an answer to this question, first of all, you need to be able to differentiate between a rat and mouse. As you must already know, they are both rodents and are quite identical. Without precisely knowing the differences between these two rodents, it will be quite difficult to know how they relate with each other and if rats do kill mice or it's just another myth.
To help you understand this in the best possible way, we will be taking a look at some of the qualities possessed by both rodents. After which we will address the main topic which is whether rats are capable of killing mice or not.
Rats
Rats are medium sized rodents with sizes bigger than that of mice. They have long tails and are very active compared to mice. The most common household rat is the black rat and this particular specie of rat is bigger than mice and also very active.
Mice
On the other hand, mice are smaller rodents with a pointed snout and small round eyes. These rodents have uniform traits; hence they often tend to look very identical. They are very docile when compared to their rat counterparts.
Having shared all these, by now you should categorically be able to differentiate between rats and mice. Coming back to the question above, the fact is rats are capable of killing mice. This habit is only exhibited when rats are faced with starvation and the only option left is to kill and feed on them.
Also, a change in environmental conditions can trigger their hunting senses and make them kill mice. Apart from any of these conditions, rats killing mice doesn't usually occur. You might have rats and mice in your home at the same time causing a nuisance.